Total noobe. Engraving too deep on leather and card

Im using a pro 3018 pro machine. I need help with setting up the bed. As when I input its actual size (as its not the size it says it is when it searches for device) it still hits the limits. ( Limit switches are next purchase. And i can’t seem to find a happy medium when trying to engrave on card and leather of around 1mm thick. It just burns straight through. Even on grey scale.

Any help would be appreciated

Leather is touchy for 7/9 oz leather I engrave at 25% power 350mm/sec on a 100w laser.
Lots of speed, low power

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